全文获取类型
收费全文 | 14399篇 |
免费 | 418篇 |
国内免费 | 52篇 |
专业分类
化学 | 10164篇 |
晶体学 | 36篇 |
力学 | 228篇 |
综合类 | 1篇 |
数学 | 2719篇 |
物理学 | 1721篇 |
出版年
2020年 | 133篇 |
2019年 | 161篇 |
2018年 | 101篇 |
2016年 | 284篇 |
2015年 | 282篇 |
2014年 | 362篇 |
2013年 | 561篇 |
2012年 | 478篇 |
2011年 | 512篇 |
2010年 | 371篇 |
2009年 | 332篇 |
2008年 | 485篇 |
2007年 | 492篇 |
2006年 | 520篇 |
2005年 | 466篇 |
2004年 | 409篇 |
2003年 | 399篇 |
2002年 | 409篇 |
2001年 | 257篇 |
2000年 | 227篇 |
1999年 | 180篇 |
1998年 | 162篇 |
1997年 | 178篇 |
1996年 | 178篇 |
1995年 | 164篇 |
1994年 | 173篇 |
1993年 | 179篇 |
1992年 | 199篇 |
1991年 | 153篇 |
1990年 | 167篇 |
1989年 | 165篇 |
1988年 | 179篇 |
1987年 | 186篇 |
1986年 | 159篇 |
1985年 | 279篇 |
1984年 | 237篇 |
1983年 | 152篇 |
1982年 | 201篇 |
1981年 | 196篇 |
1980年 | 237篇 |
1979年 | 227篇 |
1978年 | 233篇 |
1977年 | 257篇 |
1976年 | 219篇 |
1975年 | 204篇 |
1974年 | 176篇 |
1973年 | 211篇 |
1972年 | 114篇 |
1971年 | 107篇 |
1970年 | 86篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Alvaro P. Raposo Hans J. Weber David E. Alvarez-Castillo Mariana Kirchbach 《Central European Journal of Physics》2007,5(3):253-284
We briefly review the five possible real polynomial solutions of hypergeometric differential equations. Three of them are
the well known classical orthogonal polynomials, but the other two are different with respect to their orthogonality properties.
We then focus on the family of polynomials which exhibits a finite orthogonality. This family, to be referred to as the Romanovski
polynomials, is required in exact solutions of several physics problems ranging from quantum mechanics and quark physics to
random matrix theory. It appears timely to draw attention to it by the present study. Our survey also includes several new
observations on the orthogonality properties of the Romanovski polynomials and new developments from their Rodrigues formula. 相似文献
22.
Hamid Olia Erich Russi Hans Thomann 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1992,43(3):581-583
Summary An atomizer had been designed that could create an aerosol of a liquid with high viscosity. The amount of additional driving gas that had to be used was very low. In a cooperation with the University Hospital in Zurich the atomizer was miniaturized and used for treating six patients. 相似文献
23.
24.
Hans Grabmüller 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1991,42(5):783-805
Rotationally symmetric deformations of a flat annular elastic membrane under a gravitational force are studied, with prescribed radial stresses or horizontal displacements at the edges. The small-finitedeflection theory of Föppl-Hencky as well as a simplified version of Reissner's static first approximation theory of thin shells of revolution are applied which lead to consider a single, second-order, ordinary differential equation for the derivation of the principal stresses in the membrane. Using analytical methods, the range of those boundary data is determined for which the solutions of the differential equation are wrinkle free in the sense that both the radial and the circumferential stress components are nonnegative everywhere. 相似文献
25.
26.
The focus of this paper is on the following problem. Given a linear space F of complex-valued functions on a set X and a polynomial p(z), is there an algebraic composition operator on F whose characteristic polynomial equals p(z)? We show that the supply of all the polynomials p(z) for which the answer to this question is affirmative depends heavily on the structure of the space F. 相似文献
27.
28.
29.
30.